July 03, 2012, 12:34:01 am
If you are referring to adding own textures using the Standard Material type then after 25 (28 now) then there should be a Previous and Next arrow buttons to go to the next set of textures.
From memory V2B2 had a bug in this so you need to update your Lumion version.
In a lot of cases of course, the Lumion workflow is designed so users put most of the materials to be allocated in the DCC tool, then those are imported when the model is imported.